1260131561 has 8 divisors (see below), whose sum is σ = 1370241600. Its totient is φ = 1151903952.

The previous prime is 1260131549. The next prime is 1260131573. The reversal of 1260131561 is 1651310621.

It is an interprime number because it is at equal distance from previous prime (1260131549) and next prime (1260131573).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1260131561 - 2¹⁰ = 1260130537 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1260131561.

It is not an unprimeable number, because it can be changed into a prime (1260131531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 469211 + ... + 471888.

It is an arithmetic number, because the mean of its divisors is an integer number (171280200).

Almost surely, 2^1260131561 is an apocalyptic number.

It is an amenable number.

1260131561 is a deficient number, since it is larger than the sum of its proper divisors (110110039).

1260131561 is a wasteful number, since it uses less digits than its factorization.

1260131561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 941215.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 1260131561 is about 35498.3318058750. The cubic root of 1260131561 is about 1080.1198886685.

The spelling of 1260131561 in words is "one billion, two hundred sixty million, one hundred thirty-one thousand, five hundred sixty-one".